Medicare Fax Numbers by Category
Medicare's fax infrastructure is decentralized — different contractors handle different regions and functions. We have organized the most commonly needed numbers below.
Medicare Enrollment — CMS (Form CMS-855)
1-855-797-2123
For provider and supplier enrollment applications (CMS-855A, 855B, 855I, 855S). This is the Internet-based Provider Enrollment, Chain, and Ownership System (PECOS) support fax. Include your NPI and PTAN on every page.
Medicare Appeals — Redetermination (Level 1)
Varies by MAC
First-level Medicare appeals are handled by your Medicare Administrative Contractor (MAC). The fax number is printed on the Medicare Summary Notice (MSN) or Remittance Advice (RA) you received. Common MACs: Novitas Solutions, CGS Administrators, Palmetto GBA, NGS, WPS.
Medicare Appeals — Reconsideration (Level 2)
1-833-950-4482
Qualified Independent Contractor (QIC) reconsideration appeals. For Part A and Part B services, fax to the QIC listed on your redetermination decision. Maximus Federal Services handles most QIC reviews.
Medicare Appeals — ALJ Hearing (Level 3)
1-844-419-3557
Office of Medicare Hearings and Appeals (OMHA). For requesting an Administrative Law Judge hearing after an unfavorable QIC decision. Include the Medicare Appeal Number and beneficiary's Medicare ID.
Medicare Part D (Prescription Drug) Coverage Determinations
Plan-specific
Part D coverage determinations and exceptions are handled by individual Medicare Advantage or Part D plan sponsors. The fax number is on your plan's denial letter or available by calling the number on your Medicare card.
Durable Medical Equipment (DME) Prior Authorization
Varies by DME MAC
DME prior authorizations are processed by DME MACs. CGS Administrators (Jurisdiction B) and Noridian Healthcare Solutions (Jurisdiction A/D) are the two DME MACs. Fax numbers are on prior auth request forms.
Medicare fax numbers vary by region and contractor. Always confirm the fax number on the specific notice or determination letter you received before sending documents.
What You Can Fax to Medicare
Fax remains one of the primary submission methods accepted by CMS and its contractors for these document types.
Provider enrollment applications and revalidation forms (CMS-855 series)
Medicare appeals at all five levels — redetermination through judicial review
Prior authorization requests for procedures and DME
Medical records and clinical documentation supporting claims
Certificates of Medical Necessity (CMN) for durable medical equipment
Corrected claims and adjustment requests
Beneficiary complaint and grievance forms
Tips for Faxing Medicare
Practical guidance from helping healthcare providers and billing offices submit Medicare documents.
Always include the beneficiary's Medicare Beneficiary Identifier (MBI) on every page. The old Health Insurance Claim Number (HICN) is no longer accepted as a primary identifier.
For appeals, note the filing deadline on your denial notice. Most Level 1 redeterminations must be filed within 120 days. Missing the deadline means losing your appeal rights.
Include a cover sheet that states the type of submission (e.g., 'Level 1 Redetermination Appeal'), the claim number, date of service, and your contact information.
When faxing medical records to support a claim, highlight or tab the relevant sections. Medicare reviewers process thousands of pages daily and may miss unlabeled evidence.
Use AvoFax's delivery confirmation as proof of timely filing. CMS considers a fax received on the date the confirmation shows it was transmitted.
Frequently Asked Questions
Common questions about faxing documents to Medicare and CMS.